Camille bobnet



(No Model.)

C.. BORNBT.

- 30.0K DRILLING MACHINE. No. 391,449. Pa,1;11ced0015.4 23, 1888.

WIiEEEEE IIT/mim" UNITED STATES PATENT OFFICE.

CAMILLE BORNET, OF PARIS, FRANCE.

ROCK-DRILLING MACHINE.

SPECIFICATION forming part of Letters Patent No. 391,449, dated October23, 1888.

Application filed August 6, 1888. Serial No. 282,025. (No model October8, 1885, No. 70,429; in Spain July 26, 1886, No. 8,776 31, 1888, Nos.8,327 and 8,460.

To all whom, it may concern,.-

Be it known that I, CAMILLE BORNET, a citizen ofthe Republic of France,residing at Paris, in the said Republic, have invented certain new anduseful Improvements in Rock Boring or DrillingMachiues, in partapplicable to other boring-machines, (for which I have received LettersPatent in France, No. 152,183, dated November 15, 1882, with two patentsin addition dated February 15, 1887, and August 81, 1887, respectively;in Belgium, No. 70,429, dated October 8, 1885, with patent of additiondated August 3l, 1887 in England, No. 248, dated January 6,1888; inGermany, Nos. 8,327v and 8, 460V, dated January 31, 1888, and in Spain,No. 8,776, dated July 26, 1886,) of which the following is aspecification.

The present invention relates to improvements in rotary boring ordrilling apparatus capable of being actuated either byhand or power, andmore especially applicable to the economic boring of hard or soft rocksin the galleries or relative works of mines, quarries, tunnels, andthelike.

These improvements will be successively described With reference to theannexed drawings.

Figure 1 is alougitudinal section showing the application of myimprovements to a boring-machine for hard rocks driven bya direct motor.Fig. 2 is a longitudinal section showing the application of the sameimprovements to a boring-machine for soft rocks-such as coalwithreversible arrangement. Fig. 8 is a transverse section in detail of thisapparatus.

In the boring-machine represented in Fig. 1 the central screw, c, isprovided with a shoulder or collar, which abuts against cupped, dished,or curved platesprings b, designed to give a certain elasticity to thepressure of the drill or bit upon the rock. These cupped or dishedsprings are composed, as shown, of steel washers, stamped to a slightlyspherical or conical shape, and are coupled two and two, opposite theone to the other, in the manner represented in the drawings. Theboring-machine thus improved can be put in motion by hand by means of acrank and bevel-wheels; but it is preferably worked by a rotary motor,g, mounted upon it, the shaft of which trans- .l Patented in FranceNovember 15, 1882, No. 152,183; in Belgium in England January 6, 1888,No. 248, and in Germany January mits the motion to the tool-holderf bymeans of a pinion and toothed wheel h, provided with a key, l, whichslides in a groove or slot eut throughout the length of thetool-holderf. A bracket or guard, i, attached by arms to the support orframe of the motor g, serves to retain the gear-wheels h in place andprotect their teeth. rIhe rotary motor g can be driven by water, air, orsteam. It is mounted on a movable adjustable bracket orsupport, j, whichcan be secured by a set-screw in such a position that the projection ofthe motor will not interfere with the work of boring. This specialarrangement of the motor mounted on a movablesupport upon theboring-machine may be combined with all sorts of rotary boringmachineirrespective of the various purposes to which the machine may beapplied. At its end the screw a carries a lever, c, by means of which itcan be turned in either direction, according as it is desired t-oincrease or decrease the forward movement of the drill. Ball-bear ings dallow this movement to be made easily during operation, and a bolt orstud, e, retains the lever c in position during ordinary or nor malwork. This arrangement allows for the regulation at will of the ad Vanceof the drill or tool according to the hardness of the rock with which itmeets by moving or acting upon the lever c either continuously or atintervals. As the action of the spring b allows the screw a to move backslowly, according to the hardness of the rock, it is easy to regulatethe position of the bolt e (by means of the set-screw which serves tosecure it) in such a way that the lever c, moving back with the screw a,escapes automatically from the control of this bolt e as soon as thepressure upon the drill becomes too great. The screw a, being then nolonger held, and being able to turn readily on the ballbearings d, iscarried round by friction with the internallyscrewed end of the tubulartoolholder f, and this latter ceases to move i'orward until theelasticity of the springs has caused a sufficient cutting away of therock to ad mit of the forward movement being again begun.

The same improvements are also shown in the simple machine representedin Figs. 2 and 3, which is constructed with a view to boring IOO softrocks, such as coal. The drill is tted direct to the central screw, k,which has throughout its length a groove or slot wherein slides the keywhich secures it to the bevel-wheels a. These receive motion from a handlever or handle, m.

In order to avoid the loss of time necessary to return the screw 7c toits original position the nut o, whichdetermines the forward movement ofthe tool, carries a projecting ring or collar placed between two similarsets of cupsprings p, each set provided with ball-bearings q. Thisarrangement renders the apparatus reversible, andit is sufficientaftereach boring to turn the whole machine round on its supporting-trunnionsr, and to fix the tool or drill at the opposite end of the screw 7tinorder that the machine may be ready to operate again.

It will be understood that the invention is not limited to the precisearrangement shown in the drawings to render the machine reversible, andthat the employment of other kinds of springs and bearings or abutmentsarranged one each side of the nut o would permit the attainment of thesame result. This machine is provided with a lever, s, and bolt,(similar to c and 6,) which serve to regulate the feed of the machineautomatically or by hand, as hereinbefore explained. It can be turned inthe inner ring or collar, t, of the support, which serves to connect itwith the supporting-frame, and a set or thumb screw, a, engaging inholes made in the frame of the machine, retains the apparatus in theposition in which the handle m may be most easily operated when at work.The same result can be attained in a manner equally simple by mountingthe supportingpiece of the handle m upon a collar or ring capable ofturning round the apparatus, and held or maintained by means of asetscrew in the position which will permit of the machine being easilyworked. The two ends of the screw 7a being provided with similarsquares, the handle m can be made use of in order to drive this screwdirect when the softness of the rock permits.

It will be understood that the application of these improvements is notlimited to the two arrangements of rotary boring-machines shown in thedrawings. Thus in the arrangement represented in Fig. 2the drivingbevel-wheels and the suspension, by means of gimbals, may be suppressed,the screw k being then actuated simply by means ot' a ratchetlever. Inthis manner a reversible apparatus, automatically adj ustable,ofa simpleand cheap construction, is obtained.

I claim as my invention- 1. In rotary rock-boring machines, thecombination of cup-springs and ball-bearings acting as support orabutment for the central screw of the drill or its nut for the purposeof giving a certain elasticity to the pressure of the tool and foradjusting the forward movement of the latter while it is working,substantially as described.

2. In rotary rock-boring machines or drills, the combination of a doublearrangement of spherical or roller bearings or abutments, and cupped orother springs arranged on each side of the relatively-fixed nut of thecentral screw 'for the purpose of rendering the boring apparatusreversible, substantially as described.

3. In a rotary boring-machine, the combination, with the tool and itsscrew, of aspring adapted to hold the tool to its work, and a lockingdevice for the screw, all arranged substantially as shown, whereby whenthe resistance offered to the tool exceeds the force of the spring thescrew or its nut is permitted to turn.

4. In a rotary drilling-machine, the combination, with the tool and itsshell, of a motor provided with a band adapted to encircle the shell,gearing connecting the motor with the tool, and a fastening deviceadapted to hold the motor in any of its adj usted positions upon theshell of the drilling mechanism.

5. The combination, in a rotary boring apparatus, of cupped or dishedsprings b, ballbearings d, a lever, c, actuating the central screw', andan adjustable bolt, e, with a rotary motor, g, carried upon an arm. j,which can turn around the roek-drill and actuates the tool-holder bymeans of a spur-wheel gearing, It, substantially as hereinbefore setforth and shown.

6. The combination, in a rotary rock-drill, of a double arrangement ofball -bearings q and cup-springs p, bearing on the nuto of the centralscrew, an actuating-levens, provided with an adjustable bolt, and asupporting collar, t, provided with a thumb er set screw situated in thecenter ofthe double-jointed sus pension ofthe rock-drill, as and for thepurpose set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

CAMILLE BORNE'I.

NVitnesses:

EUGNE DUMAL, UHARLEs BAILLY, J r.

IOO

